水泥刨花板快速固化工艺的研究

以毛白杨、兴安落叶松和普通硅酸盐水泥为主要原料，采用二氧化碳气体喷射法研究水泥刨花板的快速固化工艺，探讨了水灰比、二氧化碳气体压力，养护条件等对水泥反应特征和水泥刨花板性能的影响。结果表明，最佳制板工艺参数为：ＣＯ２气体压力０．７ＭＰａ，通气时间３ｍｉｎ，木灰比０．２（毛白杨）或０．５（落叶松），水灰比０．３５（毛白杨）或０．４（落叶松）；水灰比不但影响成板的可能性，而且对反应特征和水泥刨花板的力     

热压水泥刨花板工艺的研究

本文主要论述了热压法制造水泥刨花板的工艺。试验选取热压温度、热压时间、水灰比、灰木比、添加剂和板子密度等工艺变量建立多元回归方程,并对刨花形态等问题进行了讨论。试验结果表明:热压温度和刨花形态对板子性能影响极为显著;热压法水泥刨花板不仅具有与冷压法相同的物理力学性能,而且还具有水泥水化速度快、板坯脱模强度较高等特点,因而缩短了水泥刨花板的生产过。     

杨木水泥刨花板工艺的研究

对杨木水泥刨花板的物理力学性能与主要工艺参数——密度、木灰比、水灰比、添加剂及添加量的关系作了研究。结果表明,密度(D)对板材性能影响最大,木灰比(W/C)次之,水灰比(W_1/C)最小;板材的主要性能如MOR、MOE、IB同密度、木灰比、水灰比的关系,可用方程Y=a_0+a_1D+a_2(W/C)+a_3(W/C)~2+a_4(W_1/C)+a_5(W_1/C)~2表示;在各种添加剂中,以氯化钙的效果最好。     

水泥刨花板的制造工艺及发展前景

水泥刨花板是以木质刨花为主要原料,辅之以其它化学添加剂经特定工艺生产的一种板材。它是一种性质优良的“代木”产品,是一种理想的新型建筑材料,在我国有很大的发展潜力。本文简要阐述了水泥刨花板的制造工艺和产品性能,并介绍了水泥刨花板在建筑上的应用前景。     

水泥刨花板快速固化工艺的初步研究

为缩短水泥刨花板的压制时间，提高生产效率，探讨了通过施加一种添加剂使得水泥刨花板快速固化的工艺。主要研究了快速压制工艺因素及其对制品性能的影响。结果表明，该法可大幅度降低水泥刨花板的压制时间，板材具有较高的脱模强度。     

水泥刨花板生产与研究进展

一、引言水泥刨花板是以木质刨花或纤维与水泥为主要原料制成的一种人造板。它兼有木材和水泥的双重性能,与普通的建筑材料相比,具有重量轻、强度大、安裝组合方便以及耐侯、耐潮湿、耐火、耐菌虫、绝缘和机械加工性能好等特点,是良好的工程     

浸渍纸饰面粉煤灰水泥刨花板的工艺研究

分析了粉煤灰水泥刨花板的特点，了浸渍纸饰面粉灰水泥刨花的制造工艺。研究结果表明，利用低压短周期ＭＦ浸渍纸对此种板材饰面时，可以在浸渍纸与基材之间施加少量增强剂，以及调整相应的热压工艺，来满足其表面胶合强度的要求。     

快速固化水泥刨花板的工艺试验

以速生杉木加工剩余物为主要原料、Na2SiO3为快速固化添加剂制备水泥刨花板,研究了冷、热压两种压板方式、Na2SiO3添加量、热压温度、热压时间、水灰比、灰木比、水泥种类和刨花形态等因素对水泥刨花板主要性能的影响.结果表明,热压法可适用于水泥刨花板制造,最佳工艺条件为:Na2SiO3添加量10%、热压温度95℃、热压时间12 min、水灰比0.6、灰木比2.6,制备的水泥刨花板的静曲强度达到10 MPa;采用MgCl2后处理能显著改善板的性能.     

冷压法粉煤灰水泥刨花板工艺研究

粉煤灰水泥刨花板是一种符合墙体材料发展方向的新型建筑材料,在预备性实验基础上,采用二次正交旋转组合设计对粉煤灰水泥刨花板进行工艺试验,结果表明,在实验设计取值范围内,板密度,水灰比及水玻璃（Na2SiO3)用量对板性能（MOR,MOE,IB）影响显著,灰木比对吸水厚度膨胀率（TS）影响特别显著。     

Manufacture and properties of oil palm frond cement-bonded board

This study was designed to reveal the role of the cement/wood ratio in a hydration test of wood-cement mixtures. The compatibility of oil palm (Elaeis guineensis Jacq) fronds-cement mixtures was tested in the hydration test, with the addition of magnesium chloride as an accelerator at different water/cement ratios. To prove the findings on the hydration behavior of components, the cement-bonded boards were manufactured using a conventional cold-pressing method at different cement/wood ratios. Results indicated that the optimum weight ration of cement/wood increased with decreasing wood powder size based on the equal specific surface area ratio of cement/wood in the hydration test and board manufacturing. The addition of magnesium chloride improved the compatibility of oil palm fronds with cement; the compatibility factor (C _A) increased by more than 90% with the addition of 5% magnesium chloride. TheC _A factor increased proportionally with a higher magnesium chloride content and a higher water/ cement ratio. The addition of magnesium chloride also enhanced the cement hydration and ultimate board strength properties. However, the addition of 5% magnesium chloride did not improve the properties of boards sufficiently at a cement/wood ratio of 2.21.0.     

Manufacturing oil palm fronds cement-bonded board cured by gaseous or supercritical carbon dioxide

This study dealt with the effects of a curing method that uses gaseous and supercritical CO₂. Its effects on the properties of oil palm fronds cement-bonded board manufactured by the conventional cold-press setting method were recorded. The effect of MgCl₂ as an accelerator of cement setting was also investigated. The hydration of cement was examined using X-ray diffractometry, thermal gravimetry, and scanning electron microscopy. The results are as follows. (1) High-performance cement-bonded boards made from oil palm fronds were successfully manufactured using the CO₂ curing method. (2) The curing method using either gaseous or supercritical CO₂ resulted in accelerated curing of cement (within several minutes). Accelerated formation of the hydration products (e.g., calcium carbonate and calcium silicate) is the main reason for the high strength of CO₂-cured boards. (3) The CO₂ curing technology does not require setting accelerators, which cause a decrease in the dimensional stability of cement-bonded board.     

Modelling of vertical density profile of particleboard,manufactured from hardwood sawmill residue

Abstract

Particleboards are generally made in three layers using softwood as the major raw material. Limitation on natural wood resources and concerns about the carbon footprint of products has created a significant interest in environmentally friendly or ‘green’ building materials. Hardwood sawmill residue, which has been disposed as solid waste, was investigated by authors as the main raw material for producing particleboard at RMIT University, Australia. Physical and mechanical properties of final particleboard were measured and analysed against original materials and process variables. The density of a particleboard along its thickness direction is not uniform, and is called the vertical density profile (VDP) which is dependent upon processing parameters. The VDP influences particleboard properties including flexural strength and its dimensional stability and fastening capacity. It is important to influence the formation of the VDP, altering processing variables, to achieve optimum particleboard properties. This paper presents an attempt to develop a model to predict the formation of the VDP of hardwood residue particleboard compared to processing parameters, using the theory of experimental design. The advantages of such a model in optimising particleboard properties are also discussed.     

石膏刨花板生产的工艺设计

由联邦德国科技部(BMFT)资助中国的项目“利用木质纤维生产人造板”,是由联邦德国弗劳霍夫木材研究所(WKI)和中国林科院木材工业研究所(CRIWI)承担。现进行了半干法生产石膏刨花板的工艺设计。为了确认原材料的适用性,中国派遣一名科技人员在WKI用中国原材料进行了试验。根据当地实际情况确定该厂的年生产能力。全部生产设备可分成热能生产、石膏煅烧和板生产三部分。     

稻草刨花板薄木贴面工艺

采用正交试验法探讨了各热压工艺因子对稻草刨花板薄木贴面的影响.试验结果表明:稻草刨花板表面饰贴薄木是切实可行的,进行0.2 mm厚水曲柳薄木贴面,在选用PVAC胶黏剂且涂胶量为100 g/m2的条件下,其较佳工艺参数分别为:热压压力为0.7 MPa、热压温度为100℃、热压时间为120 s;在选用GB-3胶黏剂且涂胶量为100 g/m2的条件下,其较佳工艺参数分别为:热压压力为0.8 MPa、热压温度为90℃、热压时间为180 s.进行0.6mm厚白橡薄木贴面,在选用PVAC胶黏剂且涂胶量为120g/m2的条件下,其较佳工艺参数分别为:热压压力0.8MPa、热压温度90℃、热压时间240 s;在选用GB-3胶黏剂且涂胶量为120g/m2的条件下,其较佳工艺参数分别为:热压压力0.7 MPa、热压温度90℃、热压时间180 s.     

桉树焦枯病对桉树生长量的损失估计研究

按照桉树焦枯病不同发病等级调查桉树各因子生长量,分析不同病级对桉树胸径、树高和材积生长的影响。结果表明,当发病等级达到Ⅳ级时对胸径、Ⅲ级时对树高、Ⅱ级时对材积的生长已经造成极显著影响。根据不同发病等级与损失率的关系进行回归分析,建立了胸径、树高和材积的损失率估测模型,该模型估测结果与调查实测数据相对误差1.32%(精度为98.68%)。以此模型估算福建省桉树人工林焦枯病危害,材积年损失率23.53%,年经济损失0.518亿元。     

提高再生刨花板性能的若干途径探讨

对提高再生刨花板物理力学性能的若干途径进行的研究结果表明：提高再生刨花板密度有助于其物理力学性能的改善;增加施胶量对再生刨花按常规工艺所制刨花板的静曲强度和内结合强度均有改善,但静曲强度仍未达到国标要求;如果将超过５０％的原生刨花加入到再生刨花中去,所制刨花板可以达到国标ＧＢ／Ｔ４８９７－９２一级品的要求。     

提高石膏刨花板耐老化性能的进一步研究

本文研究了矿渣硅酸盐水泥对石膏水化性能的影响;水泥加入量与石膏硬化浆体力学强度的关系;石膏中掺入3～12%的矿渣硅酸盐水泥时,对石膏刨花板静曲强度和耐水性能的影响;石膏刨花板表面涂建筑涂料后,对其耐老化性、耐水性以及静曲强度的影响。     

几种树种木材制造石膏刨花板的适应性

本文论述了挪威云杉、山杨、白桦和柞木及山杨、白桦、柞木的混合刨花制造石膏刨花板的适应性。结果表明,在工艺参数相同的情况下,木材密度越大的树种制成的板材强度越低,挪威云杉板强度最大,山杨板次之,柞木板极低。挪威云杉和山杨是制造石膏刨花板的优质树种。改变木膏比、刨花体积和对刨花进行水抽提均没有使白桦和柞木制成合格的石膏刨花板。混合刨花干扰石膏刨花板的凝固时间,致使板子强度低劣,在生产中应予避免。     

轻质无胶蔗渣板的研究

以蔗渣为原料,不采用合成树脂,而是加入少量环保型添加剂(有机酸或糖)压制轻质无胶蔗渣板。探讨了板的密度,以及防水剂的有无对轻质无胶蔗渣板的物理力学性能及热学性能的影响。采用X射线衍射仪(XRD)、傅里叶变换红外光谱仪(FTIR)初步分析了加入添加剂、防水剂对板的物理力学性能及胶合机理的影响,结果表明:随着密度增大,板的导热性能,MOR值和TS值上升;加入添加剂后,板的纤维素结晶度增大;加入少量防水剂(石蜡)后,板的纤维素结晶度没有明显变化,—OH吸收峰强度下降,TS下降明显;在研究范围内,板的导热系数达到国家林业行业标准LY/T 1718-2007所要求的保温材料的要求。本研究既扩大了人造板生产的原料来源,又解决了人造板产品的游离甲醛释放问题。